Renesas 7005L25JI

Overview

7005L25JI from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 25 ns max read cycle time (tRC), 1 mW typical standby power, and integrated hardware semaphore/arbitration logic. It enables simultaneous asynchronous access to shared memory in real-time inter-processor communication systems such as radar signal processors and industrial motion controllers.

For engineers reviewing the 7005L25JI datasheet, 7005L25JI pinout, 7005L25JI application, or 7005L25JI equivalent, key selection criteria include dual-port arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S configuration, semaphore address decoding (A0–A2), and compatibility with 5 V ±10% TTL-level control signals.

Technical Context

The 7005L25JI implements fully asynchronous dual-port operation with separate CE/R/W/OE controls per port, enabling concurrent reads/writes to distinct addresses without contention. Its on-chip arbitration logic resolves port conflicts via BUSY assertion (M/S = H) or BUSY input (M/S = L), with tBDD ≤ 30 ns for valid data recovery after contention.

It supports two distinct memory access modes: standard RAM access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH, SEM = VIL), where eight semaphore flags are addressed by A0–A2 and read/written via I/O0–I/O7. Data retention at 2 V is guaranteed across all temperature grades.

Key Specifications

Pinout & Package

7005L25JI is housed in a 64-pin thin quad flatpack (TQFP, package code PNG64), with 0.5 mm pitch, 14 mm × 14 mm footprint, and 1.4 mm height. All VCC pins require local decoupling; all GND pins must be connected to system ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with CY7C136-25JC and IDT70V25L25PF, the 7005L25JI uniquely delivers 5 V TTL compatibility, integrated semaphore/arbitration, and industrial temperature support in a single 64-pin TQFP - making it optimal for retrofitting legacy systems requiring deterministic inter-processor synchronization.

Availability

7005L25JI is available at Aetrix Electronics and suitable for radar signal processing, industrial motion control, and avionics display systems requiring stable component supply, long-term lifecycle assurance, and industrial temperature performance.

Supply support for 7005L25JI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

IDT (Integrated Device Technology) is a fabless semiconductor company specializing in timing, memory interface, and RF solutions, now part of Renesas Electronics.

The IDT7005 product line was designed specifically for deterministic real-time inter-processor communication, delivering hardware-enforced memory coherency in dual-CPU, DSP+FPGA, and safety-critical embedded systems.

FAQ

What is the maximum operating temperature range supported by the 7005L25JI?

The 7005L25JI is rated for industrial temperature operation from −40°C to +85°C, verified per manufacturer specifications and qualified for use in harsh environments such as factory automation controllers and outdoor radar enclosures. This range applies to all speed grades including the 25 ns variant, and is distinct from commercial (0°C to +70°C) and military (−55°C to +125°C) versions of the IDT7005 family.

Does the 7005L25JI support battery backup operation, and what voltage is required?

Yes, the 7005L25JI supports battery backup operation with guaranteed data retention at 2.0 V (VDR), as specified in Table 9 of the official datasheet. In data retention mode, ICCDR is ≤ 4000 µA across military/industrial grades, enabling operation from a single lithium coin cell. The 7005L25JI must be powered solely by the backup supply (VCC = 2 V) with CE held high to enter this ultra-low-power state.

How does the M/S pin affect BUSY signal behavior on the 7005L25JI?

When M/S = H, BUSYL and BUSYR function as push-pull outputs that assert low to indicate port contention; when M/S = L, both become inputs used to accept BUSY signals from a master device. This configuration enables hierarchical arbitration in multi-device systems. The 7005L25JI datasheet explicitly states BUSY outputs are non-tri-stated and that slave-mode BUSY inputs internally inhibit writes - a behavior confirmed in Truth Table IV and Figure 13 waveform analysis.

Can the 7005L25JI perform simultaneous reads from both ports to the same memory location?

Yes, the 7005L25JI features true dual-ported memory cells that permit simultaneous reads from both left and right ports to identical addresses without conflict or timing penalty. This capability is explicitly stated in the "Features" section and validated by the "Truth Table I" showing non-contention read operation with CE and OE active on both sides. No arbitration delay or BUSY assertion occurs during concurrent reads.

What package type is used for the 7005L25JI, and are there thermal or layout considerations?

The 7005L25JI uses a 64-pin thin quad flatpack (TQFP) with package code PNG64, measuring 14 mm × 14 mm × 1.4 mm. Layout requires symmetric VCC/GND pin decoupling: each VCC pin must have a 0.1 µF ceramic capacitor to nearest GND pin, and thermal pads (if present) must be soldered to internal ground planes per IPC-7351B. The datasheet specifies PLCC and PGA variants exist but confirms PNG64 for the "J" suffix.